石墨烯
纳米材料
氧化物
纳米技术
材料科学
水平扫描速率
超级电容器
电流密度
氧化锰
电容
碳纤维
化学工程
复合数
化学
电极
电化学
冶金
物理化学
复合材料
循环伏安法
物理
量子力学
工程类
作者
Guixia Zhao,Jiaxing Li,Lang Jiang,Huanli Dong,Xiangke Wang,Wenping Hu
出处
期刊:Chemical Science
[The Royal Society of Chemistry]
日期:2012-01-01
卷期号:3 (2): 433-437
被引量:194
摘要
A facile method to synthesize layered manganese oxide nanosheets was developed for the first time by using graphene oxide as a template. The in situ replacement of carbon atoms on the graphene oxide framework by edge-shared [MnO6] octahedra provides a new methodology to synthesize graphene-based two-dimensional nanomaterials. The transformation of graphene oxide into δ-type MnO2 nanosheets results in an especially high surface area (157 m2 g−1), which is the highest value amongst today's MnO2 nanomaterials. Moreover, the MnO2 nanosheets demonstrated prominent capacitance (∼1017 F g−1 at a scan rate of 3 mV s−1, and ∼1183 F g−1 at a current density of 5 A g−1) and remarkable rate capability (∼244 F g−1 at a high scan rate of 50 mV s−1 and ∼559 F g−1 at a high current density of 25 A g−1), indicating their promise in high energy and power density pseudosupercapacitors.
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